If three cells are connected in parallel as shown in figure, then equivalent emf would be:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $E_{eq}=\frac{\sum\limits_{i=0}^3E_i/r_i}{\sum\limits_{i=0}^31/r_i}$
As cells are connected in parallel
$E_{eq}=\frac{\frac{E_1}{r_1}+\frac{E_2}{r_2}+\frac{E_3}{r_3}}{\frac{1}{r_1}+\frac{1}{r_2}+\frac{1}{r_3}}=\frac{\sum\limits_{i=0}^3E_i/r_i}{\sum\limits_{i=0}^31/r_i}$ [By Ohm's law]